1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 *
4 * Authors:
5 * Alexander Aring <aar@pengutronix.de>
6 *
7 * Based on: net/mac80211/util.c
8 */
9
10 #include "ieee802154_i.h"
11 #include "driver-ops.h"
12
13 /* privid for wpan_phys to determine whether they belong to us or not */
14 const void *const mac802154_wpan_phy_privid = &mac802154_wpan_phy_privid;
15
16 /**
17 * ieee802154_wake_queue - wake ieee802154 queue
18 * @hw: main hardware object
19 *
20 * Tranceivers usually have either one transmit framebuffer or one framebuffer
21 * for both transmitting and receiving. Hence, the core currently only handles
22 * one frame at a time for each phy, which means we had to stop the queue to
23 * avoid new skb to come during the transmission. The queue then needs to be
24 * woken up after the operation.
25 */
26 static void ieee802154_wake_queue(struct ieee802154_hw *hw)
27 {
28 struct ieee802154_local *local = hw_to_local(hw);
29 struct ieee802154_sub_if_data *sdata;
30
31 rcu_read_lock();
32 clear_bit(WPAN_PHY_FLAG_STATE_QUEUE_STOPPED, &local->phy->flags);
33 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
34 if (!sdata->dev)
35 continue;
36
37 netif_wake_queue(sdata->dev);
38 }
39 rcu_read_unlock();
40 }
41
42 /**
43 * ieee802154_stop_queue - stop ieee802154 queue
44 * @hw: main hardware object
45 *
46 * Tranceivers usually have either one transmit framebuffer or one framebuffer
47 * for both transmitting and receiving. Hence, the core currently only handles
48 * one frame at a time for each phy, which means we need to tell upper layers to
49 * stop giving us new skbs while we are busy with the transmitted one. The queue
50 * must then be stopped before transmitting.
51 */
52 static void ieee802154_stop_queue(struct ieee802154_hw *hw)
53 {
54 struct ieee802154_local *local = hw_to_local(hw);
55 struct ieee802154_sub_if_data *sdata;
56
57 rcu_read_lock();
58 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
59 if (!sdata->dev)
60 continue;
61
62 netif_stop_queue(sdata->dev);
63 }
64 rcu_read_unlock();
65 }
66
67 void ieee802154_hold_queue(struct ieee802154_local *local)
68 {
69 unsigned long flags;
70
71 spin_lock_irqsave(&local->phy->queue_lock, flags);
72 if (!atomic_fetch_inc(&local->phy->hold_txs))
73 ieee802154_stop_queue(&local->hw);
74 spin_unlock_irqrestore(&local->phy->queue_lock, flags);
75 }
76
77 void ieee802154_release_queue(struct ieee802154_local *local)
78 {
79 unsigned long flags;
80
81 spin_lock_irqsave(&local->phy->queue_lock, flags);
82 if (atomic_dec_and_test(&local->phy->hold_txs))
83 ieee802154_wake_queue(&local->hw);
84 spin_unlock_irqrestore(&local->phy->queue_lock, flags);
85 }
86
87 void ieee802154_disable_queue(struct ieee802154_local *local)
88 {
89 struct ieee802154_sub_if_data *sdata;
90
91 rcu_read_lock();
92 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
93 if (!sdata->dev)
94 continue;
95
96 netif_tx_disable(sdata->dev);
97 }
98 rcu_read_unlock();
99 }
100
101 enum hrtimer_restart ieee802154_xmit_ifs_timer(struct hrtimer *timer)
102 {
103 struct ieee802154_local *local =
104 container_of(timer, struct ieee802154_local, ifs_timer);
105
106 ieee802154_release_queue(local);
107
108 return HRTIMER_NORESTART;
109 }
110
111 void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
112 bool ifs_handling)
113 {
114 struct ieee802154_local *local = hw_to_local(hw);
115
116 local->tx_result = IEEE802154_SUCCESS;
117
118 if (ifs_handling) {
119 u8 max_sifs_size;
120
121 /* If transceiver sets CRC on his own we need to use lifs
122 * threshold len above 16 otherwise 18, because it's not
123 * part of skb->len.
124 */
125 if (hw->flags & IEEE802154_HW_TX_OMIT_CKSUM)
126 max_sifs_size = IEEE802154_MAX_SIFS_FRAME_SIZE -
127 IEEE802154_FCS_LEN;
128 else
129 max_sifs_size = IEEE802154_MAX_SIFS_FRAME_SIZE;
130
131 if (skb->len > max_sifs_size)
132 hrtimer_start(&local->ifs_timer,
133 hw->phy->lifs_period * NSEC_PER_USEC,
134 HRTIMER_MODE_REL);
135 else
136 hrtimer_start(&local->ifs_timer,
137 hw->phy->sifs_period * NSEC_PER_USEC,
138 HRTIMER_MODE_REL);
139 } else {
140 ieee802154_release_queue(local);
141 }
142
143 dev_consume_skb_any(skb);
144 if (atomic_dec_and_test(&hw->phy->ongoing_txs))
145 wake_up(&hw->phy->sync_txq);
146 }
147 EXPORT_SYMBOL(ieee802154_xmit_complete);
148
149 void ieee802154_xmit_error(struct ieee802154_hw *hw, struct sk_buff *skb,
150 int reason)
151 {
152 struct ieee802154_local *local = hw_to_local(hw);
153
154 local->tx_result = reason;
155 ieee802154_release_queue(local);
156 dev_kfree_skb_any(skb);
157 if (atomic_dec_and_test(&hw->phy->ongoing_txs))
158 wake_up(&hw->phy->sync_txq);
159 }
160 EXPORT_SYMBOL(ieee802154_xmit_error);
161
162 void ieee802154_xmit_hw_error(struct ieee802154_hw *hw, struct sk_buff *skb)
163 {
164 ieee802154_xmit_error(hw, skb, IEEE802154_SYSTEM_ERROR);
165 }
166 EXPORT_SYMBOL(ieee802154_xmit_hw_error);
167
168 void ieee802154_stop_device(struct ieee802154_local *local)
169 {
170 flush_workqueue(local->workqueue);
171 hrtimer_cancel(&local->ifs_timer);
172 drv_stop(local);
173 }
174
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